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' 2 Sheets-Sheet I. G. S. DECATUR.

ADJUSTABLE EARTH AUGER.

" No. 501,561. Patented July 18,1893.

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(No Model.) 2 Sheets-Sheet 2.

G. s. DEGATUR. ADJUSTABLE EARTH AUGER. v

No. 501,561. H Patent d-1111 118 1893.

gamma! 94 lower part of either boring blade.

UNITED STATES PATENT OFFICE.

GRANVILLE S. DECATUR, OF HAMILTON, CANADA.

ADJ USTABLE EARTH-AUG ER.

SPECIFICATION forming part of Letters Patent No. 501,561, dated July 18,1893.

Application filed December 1, 1892. Serial No. 453,724. (No model.)

To all whom it may concern.-

Be it known that I, GRANVILLE S. DECATUR, a citizen of Canada, residingat Hamilton, in the county of Wentworth, in the Province of Ontario,Dominion of Canada, have invented a new and useful Adjustable Auger, ofwhich the following is a specification.

My invention relates to improvements in augers for boring holes,consisting of a head, segmental in structure, having an elongatedaperture through it, following closely in shape, the lines of thesegmental head, and adapted to receive two sliding arms, each bentdownward to form a part of the boring blades, and acting in conjunctiontherewith.

The objects of my improvements are, first, to provide an adjustable holeboring auger, which is capable of diametrical extension; second, toafford facilities for the proper adjustment of the boring blades, to afixed rigidity; and third, to reduce the friction, hence the labor ofboring holes consequent of older methods. I attain these objects by themechanism illustrated in the accompanying drawings, in which- Figure 1is a front elevation of an auger, showing the bent arms with boringblades attached, extending a little out of the head or casing. Fig. 2 isa side elevation of the same; and Fig. 3 is a longitudinal section ofthe casing and arms, without blades. Fig. 4 is an enlarged elevation ofthe outer side of the Fig. 5 is a plan of the same. Fig. 6 is anelevation of the inner side of the boring blade, and, Fig. 7 is a planof the same. These views embody my invention.

Similar letters refer tosimilar parts throughout the several views.

In the drawings the segmental auger head is indicated by the letter A,and its through lengthwise slot by B. The said slot, B, re-

ceives and guides to various positions or diameters, the upper part ofthe bent arms, 0, both of which when closed up, extend the whole lengthof their head, to enable the outer extension of said arms, having theirsteel boring blades, D, secured thereto, to extend to a greaterdiameter, and to give strength and stability to same. These arms arebent downward nearlyhalf the length of said blades,in order to securerigidity to same. The head, A, is provided with a central boss, E, intowhich is screwed the set screw, F, having a square head, and also anaperture through two sides thereof, for the purpose of using eitherwrench for head, or pin in said aperture for tightening said screwagainst the bent arms, O,w.hen adjusted to diametrical position. His aboss on the top of head, having a socket screwed or otherwise, for theinsertion of a handle to manipulate the auger. It will be perceptiblethat the lower part of the auger is smaller in diameter. Thisfacilitates the boring; also the lower ends of blades are bent inward,as at I, curved, as at J, and slit, as at K, to form a pointed, cuttingend, and to act as the bearer of earth,to be lifted out as soon as theinterior'of anger is filled, when boring.

What I claim as my invention, and desire to secure by Letters Patent,is-

The segmental auger head, A, having through slots, B, of same segmentalshape, and bosses, H and E, in combination with the bent arms, 0, theupper part of which follow the aforesaid segmental shape, and bendingdownwardare riveted to-the steel blades, D, bent inward as at I, curvedas at J, and slit as at K, substantially as described.

GRANVILLE S. DECATUR.

Witnesses EDWARD NEW, J OHN HENDRY.

